asp.net mvc barcode scanner Real-World Physics in Objective-C

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Forces on pilots in high-performance jet airplanes are measured in g s or g-force What does it mean if a pilot is pulling 6 g s in a power climb
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Communicate You can visit physicsppcom/ internet_lab to post the acceleration of your elevator and compare it to other elevators around the country, maybe even the world Post a description of your elevator s ride so that a comparison of acceleration versus ride comfort can be evaluated
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To find out more about forces and acceleration, visit the Web site: physicsppcom
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Bathroom Scale
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The portable weighing scale was patented in 1896 by John H Hunter People used coin-operated scales, usually located in stores, to weigh themselves until the advent of the home bathroom scale in 1946 How does a bathroom scale work
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1 There are two long and two
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short levers that are attached to each other Brackets in the lid of the scale sit on top of the levers to help evenly distribute your weight on the levers
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3 As the calibrating plate is pushed down
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by weight on the scale, the crank pivots This, in turn, moves the rack and rotates the pinion As a result, the dial on the scale rotates
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Dial Main spring
Crank Dial spring Pinion
Calibrating plate
Rack Fg
Lever
Thinking Critically
4 When the spring
force, Fsp, from the main spring being stretched is equal to Fg, the crank, rack, and pinion no longer move, and your weight is shown on the dial
2 The long levers rest on top of
a calibrating plate that has the main spring attached to it When you step on the scale, your weight, Fg, is exerted on the levers, which, in turn, exert a force on the calibrating plate and cause the main spring to stretch
1 Hypothesize Most springs in bathroom scales cannot exert a force larger than 20 lbs (89 N) How is it possible that you don t break the scale every time you step on it (Hint: Think about exerting a large force near the pivot of a see-saw) 2 Solve If the largest reading on most scales is 240 lbs (1068 N) and the spring can exert a maximum of 20 lbs (89 N), what ratio does the lever use
How It Works
41 Force and Motion
Vocabulary
force (p 88) free-body diagram (p 89) net force (p 92) Newton s second law
(p 93)
Key Concepts
Newton s first law (p 94) inertia (p 95) equilibrium (p 95)
An object that experiences a push or a pull has a force exerted on it Forces have both direction and magnitude Forces may be divided into contact and field forces In a free-body diagram, always draw the force vectors leading away from the object, even if the force is a push The forces acting upon an object can be added using vector addition to find the net force Newton s second law states that the acceleration of a system equals the net force acting on it, divided by its mass a
Fnet m
Newton s first law states that an object that is at rest will remain at rest, and an object that is moving will continue to move in a straight line with constant speed, if and only if the net force acting on that object is zero An object with no net force acting on it is in equilibrium
42 Using Newton s Laws
Vocabulary
apparent weight (p 98) weightlessness (p 98) drag force (p 100) terminal velocity (p 101)
Key Concepts
The weight of an object depends upon the acceleration due to gravity and the mass of the object An object s apparent weight is the force an object experiences as a result of the contact forces acting on it, giving the object an acceleration An object with no apparent weight experiences weightlessness The effect of drag on an object s motion is determined by the object s weight, size, and shape If a falling object reaches a velocity such that the drag force is equal to the object s weight, it maintains that velocity, called the terminal velocity
43 Interaction Forces
Vocabulary
interaction pair (p 102) Newton s third law (p 102) tension (p 105) normal force (p 107)
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